Application developers are doing their best to blur the
border between the local computer and the remote network
in the interest of improved usability, yet this trend also
means that it is becoming increasingly harder for novice
and intermediate users to know what they are sharing and
to whom. Studies show that a large percentage of users are
inadvertently sharing private information without their
knowledge. We present TrustNeighborhoods, a 2D/3D
visualization technique designed to address this problem
by making trust and sharing relationships explicit and
providing a mental model of the network that users can
quickly and easily adopt. A user study indicates a
significant improvement in trust assignment using our
technique compared to unaided assignment.